generated: '2026-07-21'
method: searched
source: >-
  https://docs.uplift.com (SDK documentation) + public registry checks (npm
  search) — Upgrade ships first-party Flex Pay client SDKs, but distributes
  them itself (CDN script tag and partner-delivered archives) rather than
  through public package registries.
description: >-
  First-party client libraries for the Flex Pay (Upgrade) partner platform.
  The web SDK (PaymentJS) loads from Upgrade's CDN via a script-tag snippet —
  "No npm installs, no build steps"; the iOS SDK is delivered to partners as a
  .zip by a Flex Pay representative; the Android SDK (upliftsdk) is delivered
  as an archive added to a local/custom Maven repository. No packages are
  published to npm, PyPI, Maven Central, NuGet, RubyGems, Packagist, crates.io,
  or pkg.go.dev.
packages:
  - language: javascript
    registry: cdn
    name: up.js (PaymentJS)
    url: https://tag.uplift.com/external/up.js
    install: >-
      Script-tag snippet with per-merchant UP-code; exposes
      window.Uplift.Payments and the <up-from-pricing> web component.
    docs: https://docs.uplift.com/docs/step-1-load-flex-pay-payments
    official: true
  - language: swift
    registry: partner-distribution
    name: Flex Pay iOS SDK
    install: Delivered to partners as a .zip file by a Flex Pay representative.
    docs: https://docs.uplift.com/docs/step-1-installing-the-sdk-ios
    official: true
  - language: kotlin
    registry: partner-distribution
    name: 'com.uplift.sdk:upliftsdk'
    install: >-
      SDK .zip (upliftsdk folder) from a Flex Pay representative, added as a
      local/custom Maven repository, then
      `implementation "com.uplift.sdk:upliftsdk:x.y.z"` in build.gradle.
    docs: https://docs.uplift.com/docs/step1-installing-sdk
    official: true
registry_checks:
  - {registry: npm, query: uplift payments, result: none-first-party}
notes: >-
  A Kotlin example project is published in the docs
  (https://docs.uplift.com/docs/kotlin-example-project).